If you are renting your car, you cannot do as you like with it, and if you stop paying, you lose transportation. Today, if you own a car it might be an absolute beater if you don't maintain it, and it might be illegal to drive without insurance, but as long as you have gas, odds are it will actually run.
Further, I wonder about the subscription model as it is applied here. Many people buy cheap cars outright because they don't like ongoing payments. If the future is a subscription model, it seems they can raise the price whenever they like (market forces aside).
While I think the whole concept of owning a car is definitely something in flux (as it should be), I hope the alternative is not just "car + subscription" and ultimately paying a higher price in the end.